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<h1 id="JD"><a href="#JD" class="headerlink" title="JD"></a>JD</h1><p><img src="/images/pasted-179.png" alt="upload successful"></p>
<h1 id="一面"><a href="#一面" class="headerlink" title="一面"></a>一面</h1><p>2021.3.11 一面  周四</p>
<p>没有自我介绍，上来就问问题</p>
<p>Java的集合简单介绍一下？<br>答：List存储有序可重复数据、Set存储无序不可重复数据、Map存储键值对。List接口的主要实现类有…</p>
<p>面试官打断，说你已经说的挺清楚了，问：如果用ArrayList存储一亿个数据有什么缺点？<br>答：查询慢（不知道存储海量数据会对ArrayList的查询性能造成影响吗？？？）。<br>ArrayList的空间浪费主要体现在list列表的结尾预留一定的容量空间（ArrayList容量不够时会扩容到原来的1.5倍）。<br>插入和删除元素效率比较低（在最后插入或删除除外）。<br>【网上查的答案：ArrayList 的默认初始容量为 10 ，要插入大量数据的时候需要不断扩容，而扩容是非常影响性能的。因此，如果明确 1亿条数据了，我们可以直接在初始化的时候就设置 ArrayList 的容量，这样就可以提高效率了】</p>
<p>ArrayList可以在中间插入元素吗，比如长度为10的ArrayList在第五个位置插入一个元素，可以吗？<br>答：可以。</p>
<p>常量和变量是什么？<br>答：（1）常量在整个程序中只能被赋值一次，在程序运行过程不会改变，用final关键字定义(final int N=10; 常量的命名规则是一般是用大写英文字母表示，如final double PI=3.14;)。<br>（2）变量分为成员变量和局部变量<br>（2.1）在类体中所定义的变量为成员变量，成员变量在整个类中都有效。类的成员变量又分为两种：静态变量和实例变量。<br>（2.2）在类的方法内声明的变量为局部变量，包括方法的参数都属于局部变量，只在当前定义的方法内有效,不能用于类的其他方法中。</p>
<p>类的变量的初始化默认值是在什么时候？</p>
<p>了解双亲委派模型吗？<br>答：双亲委派模式是在Java 1.2后引入的，其工作原理的是，如果一个类加载器收到了类加载请求，它并不会自己先去加载，而是把这个请求委托给父类的加载器去执行，如果父类加载器还存在其父类加载器，则进一步向上委托，依次递归，请求最终将到达顶层的启动类加载器，如果父类加载器可以完成类加载任务，就成功返回，倘若父类加载器无法完成此加载任务，子加载器才会尝试自己去加载</p>
<p>类加载的几个阶段说一下？<br>答：加载、链接（验证、准备、解析）、初始化。</p>
<p>类的信息加载到JVM的哪个区域？<br>答：我想想</p>
<p>你知道JVM里面有几个区域吗？<br>答：线程共享的是：堆、方法区（jdk1.8后被元空间取代）；<br>线程私有的是：程序计数器、java虚拟机栈、本地方法栈。</p>
<p>回到上面的问题，类的信息加载到JVM的哪个区域？<br>答：类的信息加载到JVM的方法区，就是jdk1.8后的元空间。</p>
<p>看看简历，你在百度实习主要做的什么？你写的代码实现什么功能？<br>答：xxx<br>然后又问了几个前端的问题，我都不大懂。</p>
<p>前端你会一点吗，比如css、标签这些？<br>答：会一些html、css的东西。</p>
<p>json是什么？<br>答：JSON (JavaScript Object Notation, JS 对象标记) 是一种轻量级的数据交换格式。</p>
<p>写一个编程题，判断一个文件里面是否包括hello字符串。一些api记不住没关系，大概写出来思路就行，主要看你代码规范和思路。<br>答：用的字符流FileReader</p>
<p><img src="/images/pasted-180.png" alt="upload successful"></p>
<p>写完后大致说了一下思路，接下来就是面试官针对代码提问。</p>
<p>第四行用的FileReader，这个字节流字符流有什么区别？<br>答：字符流处理文本文件（.txt .java .c .cpp等）；<br>字节流 InputStream、OutputStream处理非文本文件（.ppt .mp4 .jpg .doc等）。</p>
<p>第七行，如果这个文件不确定怎么办？<br>答：在键盘输入文件名后用Scan接收，或者把这个部分代码拿出来到一个方法里面，文件名设为形参，调用这个方法时传入。</p>
<p>如果这个文件不存在怎么办？<br>答：抛出异常，或者提示不存在该文件。</p>
<p>第11行为什么是5？<br>答：其他长度也行，这个数值越大读取的越快。</p>
<p>第10行写注释了啊，很好不错。第19行关闭了io流，很好。</p>
<p>如果这个文件特别特别大上百个G没法一下子读完怎么办？<br>答：把第21行放到try里面，一边读取文件一边判断。</p>
<p>这个思路很好。<br>答：我暂时没有其他思路了。</p>
<p>你有什么问题问我吗？<br>答：没有了，谢谢您。</p>
<p>面试官最后问一周能实习几天，然后简单说了一下百度跟度小满的关系就像阿里巴巴跟蚂蚁金服，度小满是从百度金融那块分出去的，工作量比较大，会加班，毕竟度小满如果有什么问题会影响百度的股票。公司有大小周，一般每个月的偶数周，第二周或第四周周六会加班，当然这个加班会给工资的。你之前在百度实习也知道百度上班下班时间，度小满也一样十点半上班不要求打卡。</p>
<p>一个小时之后hr打电话约了二面时间。</p>
<blockquote>
<p>总结：整体来说比较顺利，主要问了Java集合和jvm内存区域以及类加载过程。除此之外主要问了下之前在百度测开实习的经历，不过我前端基础比较差，问的前端的问题都不怎么会。编程题没想到是io流的，没考算法。<br>总体来说问的问题比较细节化，八股文不算多吧，面试官针对一个问题会扩展，比如会问如果数据量特别多要怎么办。</p>
</blockquote>
<h1 id="二面"><a href="#二面" class="headerlink" title="二面"></a>二面</h1><p>2021.3.16 周二 20：00  二面</p>
<p>本来约的昨天晚上七点，结果hr打电话说面试官太忙了，改成了今天晚上七点，结果六点五十hr打电话说面试官太忙了，改成了今天晚上八点。</p>
<p>面了大概四十五分钟，先开始是自我介绍。</p>
<p>先问了下未来职位意向。</p>
<p>除了Java，会其他编程语言吗？</p>
<p>先整体说一下Java的内容？<br>答：从Java基本数据机构，到面向对象，封装性继承性多态性，线程，IO流，反射，集合，spring框架等等。</p>
<p>了解JVM吗？<br>答：了解jvm的内存结构、类加载过程、垃圾回收算法。</p>
<p>说一下jvm的内存结构。<br>答：方法区（元空间）、堆、程序计数器、本地方法栈、java虚拟机栈。</p>
<p>垃圾回收主要作用于哪一部分？<br>答：堆和方法区。</p>
<p>怎么判断一个对象是否死亡？<br>答：引用计数法、可达性分析。</p>
<p>标记清除法的缺点是什么？<br>答：产生内存碎片。</p>
<p>Java就到这里，数据库用过什么？<br>答：MySQL。</p>
<p>像java一样先整体介绍一下MySQL吧。<br>答：CUID，索引（B+树），事务（ACID特征），事务隔离级别，水平分表垂直分库。</p>
<p>水平分表的规则是什么？<br>答：具体的规则忘了，就举了一个例子。</p>
<p>垂直分库用过吗？<br>答：没有实现过。</p>
<p>数据库的底层实现了解吗？<br>答：我只了解innodb。</p>
<p>问了一下innodb。<br>答：innodb是事务型存储引擎，支持事务。</p>
<p>MyISAM和InnoDB区别 ？<br>答：MyISAM是5.几之前MySQL默认的数据引擎。innodb支持外键，MyISAM不支持。MyISAM强调的是性能，每次查询具有原子性，其执行速度比InnoDB类型更快。</p>
<p>MyISAM支持什么锁，innodb呢？<br>答：MyISAM 只有表级锁(table-level locking)，而InnoDB 支持行级锁(row- level locking)和表级锁,默认为行级锁。</p>
<p>下面聊一下网络。说一下在浏览器中输入url地址 ，然后网页显示出来的过程。<br>答：整体来说分为几个阶段：1. DNS解析 2. TCP连接 3. 发送HTTP请求 4. 服务器处理请求并返回HTTP报文 5. 浏览器解析渲染⻚面 6. 连接结束 </p>
<p>整体是这样，能不能具体说一下后端的处理过程。<br>答：没明白面试官问的点，就说了一下http、https、建立tcp连接等等。后来面试官说问的是后端数据处理controller层、dao层这些。</p>
<p>最后写个代码吧，输入一个int型的数，判断它是不是3幂数。先讲一下思路，然后用java写一下代码。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">public class Main &#123;</span><br><span class="line">    public static void main(String[] args) &#123;</span><br><span class="line">        if(solution(27)) System.out.println(&quot;yes!&quot;);</span><br><span class="line">        else System.out.println(&quot;no!&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">    public static boolean solution(int n) &#123;</span><br><span class="line">        if(n == 1) return true;</span><br><span class="line">        while(n &gt;= 3)&#123;</span><br><span class="line">            //n对3取余，结果不为0</span><br><span class="line">            if(n % 3 != 0) return false; </span><br><span class="line">            //n对3取余，结果为0</span><br><span class="line">            n /= 3;</span><br><span class="line">            if(n == 3) return true;</span><br><span class="line">        &#125;</span><br><span class="line">        return false;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>其实编程题完了之后面试官还说了挺多，包括说了下度小满的加班，问我实习有什么目的吗，在度小满能学到金融类的知识等等。<br>面试的时候基本没有问框架、高并发、Linux的问题。</p>
<p>面试完已经快九点了，第二天上午十点hr就打电话道歉说昨天这么晚才面试，然后恭喜我二面通过，约了三面的时间，说三面不会问什么技术问题了。</p>
<h1 id="三面"><a href="#三面" class="headerlink" title="三面"></a>三面</h1><p>2021.3.18 周四 15：00  三面</p>
<p>三面应该是经理面吧，主要在聊之前的实习经历、学校的情况，没有技术性的问题。</p>
<p>结果：面试完立马hr打电话给了结果</p>
<blockquote>
<p>总之，度小满的hr和面试官都超级nice，回答不上来的问题会提示，我最后提的问题也都会耐心详细解释，很好的一次体验。后来入职后感觉团队工作氛围特别好，同事友善，下班也比较早，leader特别好，总之就是很好很好</p>
</blockquote>
<p id="div-border-top-blue">
<span style="color:#f63;">
  <i>2022.1 更：</i>
  </span>
  <br>
  把实习的经历做成了一个视频：
  <br>
  https://www.bilibili.com/video/BV1FU4y1M73P?share_source=copy_web
  <br>
  欢迎三连哦！
</p>
      
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